I am not sure if that is all that great.....since they came from a hatchery, it is probably one of those white bird that snuck over the fence to mate with a Welsummer however genetics do play a part in getting some "sport or white" Welsummers. Those were not albinos.
If they have been breeding all that time, I would need to see the body photos, type, and all that jazz. I know folks like to do that kind of thing but white birds are blaaaaaaaaah to me LOL! I do not see anything attractive about white birds but it's neat to see if they do produce dark terra cotta eggs.
I would have to say those are project Welsummers.......doubt if most of us or the APA would accept White Welsummers unless people do have a demand for dark egg layers plus meat fowl.
Royce, Nate and all the mentors, I'm on the fence on this!